Since we are not adding armor to the Free Trader, we move on, having already noted that our hull has an Armor Value equal to its TL, 10.

If we were going to add armor, we'd use the tables on page 336, noting that:

* the "first layer" is the hull skin, and is "free".
* the value inside the table is the total tonnage for the total layers of armor.
* if you prefer formula: each additional layer takes up 4% of the "hull volume" in tons.

That's right, armor is free. The volume required is the deciding factor.